Free shuttle from airport took a while, but I got to my cozy room in one piece. I got in very late, and it seemed the shuttle driver doubled as the checkin attendant at the hostel as well, perhaps accounting for the wait time. The shuttle arrives in front of a specific terminal with a sign for hotel buses which includes Hostal Viky on it.
My room had two twin beds, a tv, shower, toilet, bidet, dressers, and A/C. Cozy enough for a simple layover in Madrid. Shuttle in the morning starts at 7. I got to my plane on time, and that’s all I can ask for. Thank you!